Explicitly set PKG_CONFIG_PATH when `--with-openssl-dir` is used for older Rubies.
Otherwise, Ruby will attempt to link to the latest OpenSSL found by pkg-config,
which could be incompatible.
This merges "standard_build" and "standard_install" build steps into one again
and modifies "standard_install_with_bundled_gems" to just invoke "standard"
with the addition of `update-gems` & `extract-gems` targets.
Using `--with-ext=+` only has the indended effect (compiling all extensions that would normally get compiled) on Ruby 2.5+. On older versions, it causes none of the default extensions to get compiled, resulting in a defunct installation.
A very common type of build failure is that the Ruby "openssl" extension failed to compile. However, when that happens, ruby-build just prints a generic "BUILD FAILED" message. To find out what happened, the user would first have to open the ruby-build log, note the "Following extensions are not compiled" section, then figure out how to find the exact location to the "ext/openssl/mkmf.log" file for more information.
Now, when `make` fails, ruby-build will automatically forward the "Following extensions are not compiled" information to stderr.
Normally, Ruby `make` step will print a warning about any missing
extensions, but will not abort the build and instead proceed as normal.
Since Ruby installations without openssl or psych are essentially
broken, ruby-build used to have a `verify_openssl` build step to test if
the newly built Ruby can load these extensions, and print helpful
information and abort the build on errors:
Loading the Ruby openssl extension failed
ERROR: Ruby install aborted due to missing extensions
The `verify_opensl` implementation was necessary to provide a good
experience for ruby-build users, but was hacky and I would prefer to
eliminate it.
It appears that passing `--with-ext=openssl,psych` to the Ruby configure
step marks those extensions as mandatory and fails the `make` process if
they failed to build. This is exactly the behavior we want, so this
enables the configure option for all Ruby builds.
It seems like there exist platforms that have wget which does not
support the `--show-progress` option. This reverts to using wget in its
default verbose mode where a progress bar and bunch more information are
printed to stderr.
